Safety production tubular column for same-well production and injection in offshore oilfield

Abstract

The invention provides a safety production tubular column for same-well production and injection in an offshore oilfield. The safety production tubular column comprises a liquid injection layer sand filtering tube arranged in a corresponding position of an injection layer and a liquid production layer sand filtering tube arranged in a corresponding position of a production layer, wherein the liquid injection layer sand filtering tube and the liquid production layer sand filtering tube are vertically connected, a filling sand-control packer is arranged at the connecting position, a suspension packer is arranged at the upper end of the liquid production layer sand filtering tube, a long sealing inserting tube penetrates through the center of the liquid production layer sand filtering tube, the lower end of the long sealing inserting tube is connected to the liquid production layer sand filtering tube straightly, and the upper end of the long sealing inserting tube is connected with a volume barrel above the suspension packer. According to the safety production tubular column, defects in the prior art can be effectively overcome, the tubular column has the characteristics that liquid production and injection in one well in the offshore oilfield can be realized and the offshore safety production requirement is met, and the tubular column is particularly applicable to the development of the offshore oilfield.

Description

technical field [0001] The invention relates to a production pipe string for petroleum development, in particular to a safe production pipe string for production and injection in the same well in an offshore oil field. Background technique [0002] At present, water injection lag and imperfect injection-production well pattern have become one of the important factors restricting the recovery of offshore oilfields. Improving the effect of water flooding by increasing the number of water injection wells is not only costly, long cycle, and slow to take effect, but also the utilization rate of oil and water wells is low, and the water injection of a single well platform in some remote blocks has a greater impact. Especially for offshore oil fields, the cost of drilling and workover operations is relatively high, and the number of wellbore layouts on the same oil production platform is limited. A considerable number of oil production platforms are required to complete the configu...

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Problems solved by technology

[0003] Such as Chinese patent ZL0810014809.4, the announcement date is January 28, 2009, and the name is the same well production and injection method and pipe string. It discloses a same well production and injection method and pipe string. Composed of cup packers, electric submersible pumps, sealing devices, hand-off joints, packers, screens, and plugs, it can realize the production of water from the water production layer in the same well in onshore oilfields and inject it into the injection layer. However, since the open patent does not have the safety production control technology required by offshore oilfields, and does not consider the current situation of sand production in offshore sand production reservoirs, it is only applicable to oil wells that are not prone to sand production in onshore oil fields, and its application range is limited.

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